hello
i don't know if any1 tried or found this but.. i was anxious to find were is the cemetery located,but i had no result,so here is what i did.
this requires mafiacon!
load up mission 11.01 visiting rich people (only works from interiors or salieri's bar)
open up console (~) and type "setpost 12 -1443.386963 -2.953213 213.758926"
were id 12 is the actor (player)
you will spawn at the frank's grave. if you move you will fall !
don't move ! press HOME and try to move that way.
good luck

Ah I remember this about ten years ago I released a document called 'Mafia observations' which had little secrets like Frank's headstone in, come to think of it I can't even remember who first discovered this _________________

Yip. Already known
If you see some special place in cutscene, then if there is no loading screen, that means that this place in on this same map. I guess in Carlo mission when you will fly away from map, you will see hangar from cutscene.